Electbic heajotg apparatus



A. D. MACPHERSON.

ELECTRIC HEATING APPARATUS. APPLICATION m50 1M/27.1918.

' soN, Vofathe citymcf AChicago,in Iof Cook and 'State or' Illinois, Q rarily .residing at 148 Vendome avenue,

. of Canada (whose post-oilice ALEEIRT D. MACPHERSGN, OF CHICAGO, ILLNIS.

ELEG'ERC HEJLTING- .APAR-ATUS. 0

application tiled May 27, 1918. Serial No. o.

To all whom t 'may conce/m.' y

` Be 1t known 'that I, ALBERT l). Macrnnnthe county Notre Dame de Grace, in the city of Montreal, county oi Hochelaga,

and Dominion v address is 148 Vendome avenue, lil. l), Gr., MontreaLCanada,) have invented certain new and useful Improvements in Electric Heating Apparatus; and I do hereby declare that the following is a full, clear, andexact description thereof.

to either the heating ot water or a plate surface, the latter to be used as a hot-plate invention may be iliary element, a primary winding. and a heat transmitting member integrally united to the core and forming a magnetic portion thereof such member being' of a section to carry the flux in the rest of the core, and a heat producing annular member in intimate relation with the said heat transmitting member and lserving as a secondary winding.

As just mentioned, my invention is capable of sei/eraly applications and for purpose of illustration, I will describe it specifically applied to a heater for flowing water and a heater :tor a flat surface such as the well known hot-plate. The water heater, according to my invention, comprises a core, in the form of a relatively heavy iron pipe for conducting the water to be heated, this pipe being surrounded and having' in inl timate contact therewith an annular' or short circuitedstrip of metal serving as a seeondary winding, while the primary winding encirclcs the secondary and is insulated therefroi'n by any vsuitableinsulation pressed on the pipe and inclosing the secondary. The core and its auxiliary element are preferably laminated. In the case, of the fiat surface, the het plate for instance, the heat transinittinp,` legT of the core consists of a magnetic member whichis an integral part of the hot-plate and of such section as to carry the nur in the rest of the core, the annular metal seconder being also an integral part of the hot-p ate.

Specification of Letters Patent.

and tempoof taken online 2 2 Fig.

inventionrelates particularly to a de- Vice the essential'. of which may be applied strip being Fatented Nov. 11, 193119.

For full comprehension, however, of m invention, reference must be had to the accompanying 'drawings in which similar rer'- erence characters indicate the same parts, and wherein;

igjure 1 is a longitudinal vertical seotional view of a water heater constructed' according to my invention;

Fig.`2 is a transverse sectionalview there- Fig. 3 is a detail View of a water heating system having my invention applied thereto;

Fig. 41 is a side elevation of an electrical hot-plate containing my invention; Fig. 5 is an end elevation thereof; and

Fig. 6 is a detail perspective view of the hot-plate and the parts formed integrallyv therewith removed.

The essentials of my invention are illus-` trated in the various vfigures of the drawings in their peculiar embodiments to suit the particular applications. ln Figs. 1, 2 and 3, illustrating the heater for flowing water, the magnetic core consists of a pipe 10 having as a component part an auxiliary laminated element 12 of U-form, the legs of the U,-e1-l and' l5 being furnished at their endswwith lugs 16 by which they are magnetically united to the ends of vthe pipe 10 which 'is sui'liciently heavy between the legs Ll and l5 to carry the flux. The lugs 16 are preferably formed vwith tapped holes and screwed upon the ends of the core 10, the lugs being secured to the ends oi' the legs b v screw bolts 11. This core is surrounded by a secondary winding which consists of a sleeve 18 preferably formed by a strip of metal oli slightly less widtlrthan the space between the lugs i6 thus leaving a clearance between the secondary and these lugs, such wrapped around the core with the ends abutting' and welded, or otherwise short-.circuited A suitableinsulation indicated at 2O is pressed on the core in these clearance spaces and completely over the secondary thereby'completely insulating the saine; while the primary winding, preferably a coil 21, surrounds this insulation and the secondary. When this primary is energized a magnetic flux is induced inthe core and its auxiliary element and this linx in turn induces a. current in 'the secondary riater lowing therethrough, will heat the latter, and the heat transmitted through the pipe may be readily varied bv increasing or decreasing the number of turns in the primary coil. n

In Figs. 4, 5 and', in place ofthe pipe as a heat transmitting leg of the core, a rib 30 is em lo ed. This rib is of magnetic metal an o? such section to carry the flux in the rest of the core, and 1s cast integrally With the hot-plate, indicated at'31, and eX- tends diametrically across one side thereof. The secondary in this embodiment is extension 32 of the hot plate and is also cast integrally therewith and is of annular form surrounding the primary coil 33 which is carried by the laminated core 34. The auxiliary element of the core which is also laminated is indicated at 35 and with its legs in intimate magnetic connection with the rib and the adjacent side of the hot'- late. Screws 60 rigidly secure the aux1lvlary element to the core. When the primary 33 is energized a magnetic ilux is induced in the core and this flux' in turn induces a current in the secondary 32. This ,current produces the heat which when transmitted directly and through the rib 30 to a primary winding, a core, a laminated auxf iliary element of substantially U-orm each lamination being at and of uniform width and thickness throughout, means -rigidly securing the laminations together, and a secondary Winding insulated trom the core consisting of an annular heat producing member surrounding the core.

2. An electric hot-plate comprising a plate, a core, a laminated auxiliary element of substantially U-form formed integrally with the core, the plate having an integral middle rib of such section to carry the flux in the core, and a secondary Winding consisting of a heat producing ring of greater depth than thickness and forming an integral extension of the plate and rib; and a primary winding carried by the core.

3. An electric hot-plate comprising a plate, a core, a laminated auxiliary element of substantially U-form formed integrally with the core, the platevhaving an integral middle rib of such section to carry the flux in the core and a secondary winding consisting of a heat producing ring of greater depth than thickness and forming an integral extension of-the late and rib; a primary winding carried) by the core; and means for regulating the heat' produced.

4. An electric hot-plate comprising a plate having a transverse middle rib u'pon its underside of magnetic metal, a secondary winding consisting of a heat producing ring or' greater depth than thickness forming an integral extensionof the plate and ring, a `core located centrall of the ring, a primary winding upon t e core and a laminated auxiliary element of substantially U- form sitraddling the ring and' formed integrallyfwith the'core, the' core and element being spaced from the secondary or the purpose of reducing magnetic leakage.

In testimony whereof I have signed my name 'to thisl specification in ,the presence of two witnesses.

ALBERT D. MACPHERSON.

Witnesses: j Y

GORDON/G. COOKE, William/M J. C. Hnwn'rsoN. 

